Self-Assembly of Quantum Dots and Rings on Semiconductor Surfaces.- Curved Two-Dimensional Electron Systems in Semiconductor Nanoscrolls.- Capacitance Spectroscopy on Self-Assembled Quantum Dots.- The Different Faces of Coulomb Interaction in Transport Through Quantum Dot Systems.- Far-Infrared Spectroscopy of Low-Dimensional Electron Systems.- Electronic Raman Spectroscopy of Quantum Dots.- Light Confinement in Microtubes.- Scanning Tunneling Spectroscopy of Semiconductor Quantum Dots and Nanocrystals.- Scanning Tunneling Spectroscopy on III-V Materials: Effects of Dimensionality, Magnetic Field, and Magnetic Impurities.- Magnetization of Interacting Electrons in Low-Dimensional Systems.- Spin Polarized Transport and Spin Relaxation in Quantum Wires.- InAs Spin Filters Based on the Spin-Hall Effect.- Spin Injection and Detection in Spin Valves with Integrated Tunnel Barriers.- Growth and Characterization of Ferromagnetic Alloys for Spin Injection.- Charge and Spin Noise in Magnetic Tunnel Junctions.- Nanostructured Ferromagnetic Systems for the Fabrication of Short-Period Magnetic Superlattices.- How X-Ray Methods Probe Chemically Prepared Nanoparticles from the Atomic- to the Nano-Scale.